Table 1

 Diagnoses of the 149 patients studied

Univentricular heart (8 after Fontan surgery, 1 after bidirectional Glenn anastomosis, 1 after atrioseptectomy, 3 without surgery)13
Congenitally corrected transposition of the great arteries9
Transposition of the great arteries (4 after arterial switch operation, 20 after Senning procedure, 23 after Mustard procedure)47
Tetralogy of Fallot32
Truncus arteriosus2
Aortic coarctation7
Aortic valve stenosis3
Pulmonary stenosis (4 valvar, 1 infundibular, 1 peripheral)6
Ebstein’s anomaly7
Atrioventricular septal defect1
Ventricular septal defect5
Atrial septal defect3
Persistent foramen ovale3
With mitral valve prolapse3
Abnormal left coronary artery originating from the pulmonary artery1
Left ventricular aneurysm of unknown origin1
Idiopathic dilatation of the pulmonary artery1
Structurally normal hearts tested for the assessment of arrhythmia5